shared/tests: add tests for libnm-core-aux
These tests cannot (easily) be under "shared/nm-libnm-core-aux/tests" because libnm/libnm-core requires code under shared while "nm-libnm-core-aux" requires libnm/libnm-core. With autotools that is not problem, but with meson we include sub directories in a particular order and there is no way to foward declare stuff (AFAIK). To avoid the circular dependency, add the tests to "clients/common/tests", which is always built last.
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